Proprioceptive neuromuscular facilitation (PNF) is a form of assisted stretching. It combines passive stretching with muscle contraction. First, your partner applies force to stretch your muscle ...

The subscapularis is a muscle in your shoulder that helps you internally rotate your arm. When your arm is internally rotated, it means that your palm is facing back, behind your body. The ...

You need to do stretching and mobility exercises to gain an advantage when you run because your muscles and joints go through ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. We stretch for lots of ...